Convert 140 psi to feet of head.

To convert pounds per square inch (psi) to feet of head, we can use the formula that relates these two measurements in a fluid system. The formula is:

[

\text{Feet of head} = \frac{\text{Pressure (psi)} \times 2.31}{\text{Specific Gravity of the fluid}}

]

For water, the specific gravity is approximately 1, so we can simplify this to:

[

\text{Feet of head} = \text{Pressure (psi)} \times 2.31

]

Given a pressure of 140 psi, the calculation would be:

[

\text{Feet of head} = 140 , \text{psi} \times 2.31 \approx 323.4 , \text{feet}

]

This calculation shows how a pressure in psi converts into an equivalent height in feet of water column, illustrating the relationship between pressure and the height of a fluid due to gravity. Thus, 140 psi corresponds to approximately 323.4 feet of head, making this the correct response.